From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH v2 2/2] x86/hvm: Don't intercept #UD
 exceptions in general
Date: Wed, 27 Jan 2016 15:21:03 -0500
Message-ID: <20160127202103.GB4275@char.us.oracle.com>
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To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Jan Beulich <JBeulich@suse.com>, Xen-devel <xen-devel@lists.xen.org>, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>, Jun Nakajima <jun.nakajima@intel.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
List-Id: xen-devel@lists.xenproject.org

On Wed, Jan 27, 2016 at 07:57:00PM +0000, Andrew Cooper wrote:
> On 27/01/2016 19:52, Konrad Rzeszutek Wilk wrote:
> >> diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
> >> index 674feea..7a15d49 100644
> >> --- a/xen/arch/x86/hvm/hvm.c
> >> +++ b/xen/arch/x86/hvm/hvm.c
> >> @@ -93,12 +93,10 @@ unsigned long __section(".bss.page_aligned")
> >>  static bool_t __initdata opt_hap_enabled = 1;
> >>  boolean_param("hap", opt_hap_enabled);
> >>  
> >> -#ifndef NDEBUG
> >> +#ifndef opt_hvm_fep
> >>  /* Permit use of the Forced Emulation Prefix in HVM guests */
> >> -static bool_t opt_hvm_fep;
> >> +bool_t opt_hvm_fep;
> >>  boolean_param("hvm_fep", opt_hvm_fep);
> > Since you remove the debug option you should probably also update the 
> > documentation which says: ">Recognized in debug builds of the hypervisor only."
> 
> This doesn't change the "debug-only"-ness of the option.
> 
> Observe in the first hunk to hvm.h that opt_hvm_fep is defined to 0 in a
> non-debug build, which causes this hunk to be omitted.

I missed that. Sorry for the noise.
> 
> This actually matches the original introduction of opt_hvm_fep, before
> it was reduced in scope to only hvm.c.  I now need it available again in
> other translation units.
> 
> ~Andrew